Synchronous construction method of near height-unequal foundation pit

Abstract

The invention relates to a synchronous construction method of near height-unequal foundation pit. The construction method comprises the main steps of: adjusting the height of a ground continuous wall and the position of a steel support; constructing the ground continuous wall; constructing a SMW construction pile; constructing a SMW construction pile crown beam and a concrete support; excavating deep foundation pit and shallow foundation pit earth to the bottom of the steel support; erecting the steel support; excavating the deep foundation pit and shallow foundation pit earth; constructing a baseplate of a deep foundation pit structure; dismounting the steel support; constructing a side wall of the deep foundation pit structure; synchronously constructing a top plate of the deep foundation pit structure and a baseplate of a shallow foundation pit structure; constructing a side wall of the shallow foundation pit structure; filling the earth at the upper part of the top plate of the deep foundation pit; dismounting the concrete support; and the like. The construction method has the following beneficial effects: the top surface elevation of the ground continuous wall of the deep foundation pit is parallel to the bottom of the shallow foundation pit, so that the height of the ground continuous wall is reduced, and the engineering quantity of an envelop structure is reduced; and the earth excavation of the deep foundation pit and the shallow foundation pit and the construction of a main body structure are convenient, so that repeated procedure conversion is reduced, the cross operation is prevented, and the efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of foundation pit construction, in particular to a method for synchronously constructing foundation pits adjacent to unequal heights. Background technique [0002] Open-cut foundation pit construction technology has a long history, but the second-line and third-line parallel adjacent foundation pits of different heights are relatively rare in open-cut foundation pit engineering. How to do a good job in the connection between the earthwork excavation of this type of foundation pit and the construction of the main structure, to ensure the quality and safety of foundation pit construction, construction progress, and reduce engineering costs is a subject worth exploring. [0003] Adjacent foundation pits with unequal heights are easy to be encountered in municipal road projects and cross-river (river) tunnel projects. In order to increase the benefit range of traffic along both sides of the river (river), multi...

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Problems solved by technology

[0008] 1. The parts below the ramp (shallow pit) and the main line (deep pit) steel support cannot be excavated synchronously, resulting in the base excavation of the construction ramp, which needs to be carried out after the main line structure is completed, and the construction period is long

[0009] 2. During the construction of the ramp structure, the ground connection wall needs to be removed, causing large disturbance and wasting resources such as steel bars and concrete

[0010] 3. The connection conditions between the side wall of the main line and the bottom plate of the ramp are poor, and the workload of planting reinforcement is large, or a mechanical connection sleeve is reserved, which is easy to misalign and leak

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